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H5N1 H5N1 Virus Human Health Risks Human Cases Bird Flu Public Health Impact on Animals Vaccines Highly Pathogenic Avian Influenza Human Health Impact H5N1 Bird Flu Symptoms H3N8 Strain H5 Subtype Public Awareness H7N9 Highly Pathogenic Bird Flu Transmission Zoonotic Diseases Transmission to Humans A(H5N1)